Key structure and scissors-type connecting member thereof

Abstract

A scissors-type connecting member includes a first frame and a second frame. The first frame includes a rotating shaft. The second frame includes a pivot hole, an entrance and a stopper. After the rotating shaft is introduced into the pivot hole through the entrance, the first frame is pivotally coupled to the second frame. The stopper is located near the entrance or arranged between the entrance and the pivot hole. A position of the rotating shaft is limited between the stopper and the pivotal hole by the stopper. Consequently, the scissors-type connecting member is assembled easily, and the stability of connecting a first frame and a second frame of the scissors-type connecting member is enhanced. Moreover, the present invention also provides a key structure with the scissors-type connecting member.

What is claimed is: 
     
       1. A scissors-type connecting member, comprising:
 a first frame comprising a rotating shaft, wherein the rotating shaft is disposed on an outer surface of the first frame; and 
 a second frame comprising a mounting part, wherein the mounting part is disposed on an inner surface of the second frame, and the mounting part comprises an entrance, a pivot hole and a stopper, wherein after the rotating shaft is introduced into the pivot hole through the entrance, the first frame is pivotally coupled to the second frame, wherein the stopper is located near the entrance or arranged between the entrance and the pivot hole, and a position of the rotating shaft is limited between the stopper and the pivotal hole by the stopper; wherein a top surface of the stopper is located near the entrance, and the stopper has a stopper width corresponding to an axial length of the rotating shaft, the entrance has an entrance width corresponding to the axial length of the rotating shaft; wherein the stopper width and the entrance width are both smaller than the axial length of the rotating shaft. 
 
     
     
       2. The scissors-type connecting member according to  claim 1 , wherein a sum of the entrance width and the stopper width is substantially equal to a depth of the pivot hole. 
     
     
       3. The scissors-type connecting member according to  claim 1 , wherein a top surface of the stopper is in parallel with the entrance and lower than the entrance. 
     
     
       4. The scissors-type connecting member according to  claim 1 , wherein the mounting part further has a guiding surface, and two ends of the guiding surface are located near the entrance and a bottom side of the pivot hole, respectively, wherein the rotating shaft is guided to the pivot hole along the guiding surface. 
     
     
       5. The scissors-type connecting member according to  claim 4 , wherein a top side of the pivot hole has a curved surface, and the bottom side of the pivot hole is has flat surface, wherein the rotating shaft comprises a curved periphery and two flat slant surfaces, and the two flat slant surfaces are respectively extended from two opposite sides of the curved periphery, wherein after the rotating shaft is introduced into said pivot hole, the curved periphery is contacted with the top side of the pivot hole, and the bottom side of the pivot hole and the guiding surface interfere with the two flat slant surfaces, so that a rotating angle of the first frame relative to the second frame is limited. 
     
     
       6. A key structure, comprising:
 a base plate; 
 a keycap disposed over the base plate; and 
 a scissors-type connecting member arranged between the base plate and the keycap, wherein the keycap is moved upwardly or downwardly relative to the base plate through the scissors-type connecting member, and the scissors-type connecting member comprises:
 a first frame comprising a rotating shaft, wherein the rotating shaft is disposed on an outer surface of the first frame; and 
 a second frame comprising a mounting part, wherein the mounting part is disposed on an inner surface of the second frame, and the mounting part comprises an entrance, a pivot hole and a stopper, wherein after the rotating shaft is introduced into the pivot hole through the entrance, the first frame is pivotally coupled to the second frame, wherein the stopper is located near the entrance or arranged between the entrance and the pivot hole, and a position of the rotating shaft is limited between the stopper and the pivotal hole by the stopper; wherein a top surface of the stopper is located near the entrance, and the stopper has a stopper width corresponding to an axial length of the rotating shaft, the entrance has an entrance width corresponding to the axial length of the rotating shaft; wherein the stopper width and the entrance width are both smaller than the axial length of the rotating shaft. 
 
 
     
     
       7. The key structure according to  claim 6 , wherein a sum of the entrance width and the stopper width is substantially equal to a depth of the pivot hole. 
     
     
       8. The key structure according to  claim 6 , wherein a top surface of the stopper is in parallel with the entrance and lower than the entrance. 
     
     
       9. The key structure according to  claim 6 , wherein the mounting part further has a guiding surface, and two ends of the guiding surface are located near the entrance and a bottom side of the pivot hole, respectively, wherein the rotating shaft is guided to the pivot hole along the guiding surface. 
     
     
       10. The key structure according to  claim 9 , wherein a top side of the pivot hole has a curved surface, and the bottom side of the pivot hole has a flat surface, wherein the rotating shaft comprises a curved periphery and two flat slant surfaces, and the two flat slant surfaces are respectively extended from two opposite sides of the curved periphery, wherein after the rotating shaft is introduced into said pivot hole, the curved periphery is contacted with the top side of the pivot hole, and the bottom side of the pivot hole and the guiding surface interfere with the two flat slant surfaces, so that a rotating angle of the first frame relative to the second frame is limited. 
     
     
       11. The key structure according to  claim 9 , further comprising:
 a membrane switch circuit disposed on the base plate, wherein when the membrane switch circuit is triggered, a key signal is generated; and 
 an elastic element disposed on the membrane switch circuit, wherein a lower part of the elastic element is contacted with the membrane switch circuit, the elastic element is penetrated through the scissors-type connecting member, and an upper part of the elastic element is contacted with the keycap, wherein the elastic element triggers the membrane switch circuit when the elastic element is pushed by keycap, or the elastic element provides an elastic force to the keycap.